object ForLoopTwo { def main(args: Array[String]): Unit={for(i <- 1 until 11){ println("卢本伟牛逼!!!") } } } 4.4.3循环守卫 1)基本语法 for(i <- 1 to 3ifi != 2) { print(i+ " ") } println() (1)循环守卫,即循环保护式(也称条件判断式,守卫)。保护式为true则进入循环体内...
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Scala nested function A nested function, also called an inner function, is a function defined inside another function. main.scala def minmax(x: Int, y: Int) = val min = (x: Int, y: Int) => if x < y then x else y val max = (x: Int, y: Int) => if x > y then x else...
Scala还包含了若干函数式语言的关键概念,包括高阶函数(Higher-Order Function)、局部套用(Currying)、嵌套函数(Nested Function)、序列解读(Sequence Comprehensions)等等。 Scala运行于Java平台(Java虚拟机),并兼容现有的Java程序。它也能运行于Java ME, CLDC(Java Platform, Micro Edition Connected Limited Device ...
Java 5 introduced the “Enhanced for loop” syntax which allows you to replace 1 2 3 4 5 Collection<String> strings = new ArrayList<String>(); Iterator<String> it = strings.iterator(); while (it.hasNext()) { String theString = it.next(); } with the much simpler 1 2 3 for (Stri...
另外,类可以被子类化,而且Scala还提供了基于mixin的组合(mixin-based composition)。与只支持单继承的语言相比,Scala具有更广泛意义上的类重用。Scala还包含了若干函数式语言的关键概念,包括高阶函数(Higher-Order Function)、局部套用(Currying)、嵌套函数(Nested Function)、序列解读(Sequence Comprehensions)等等。
def receive = { case x: Int => // do task if (x == 42) { context.stop(self) } else { context.become(({ case y: String => // do nested task }: Receive).andThen(x => { unstashAll() context.unbecome() }).orElse { case x => stash(x) }) } } reactWithin方法使用下...
Because the total number of iterations is the product of all of the iterators, adding a nested loop that will iterate once will not change the number of iterations, whereas a nested loop that does not iterate will cancel all iterations. Here is an example of a for-loop with two iterators...
嵌套迭代(nested iteration) def grep(pattern: String) = for ( file <- filesHere if file.getName.endsWith(".scala"); line <- fileLines(file) if line.trim.matches(pattern) ) println(file + ": " + line.trim) 可以在迭代的过程中,绑定中间值到一个变量 ...
Value class的constructor只有一个val参数,只存在一个method,其中不包含var, val, nested classes, traits, or objects. Value class继承自AnyVal,不能被其他class继承。Value class不能extends trait,除非trait继承了Any。 trait Printable extends Any { def print(): Unit = println(this) } class Wrapper(val...